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DE1480277B2 - DUPLEX DRUM BRAKE FOR MOTOR VEHICLES - Google Patents

DUPLEX DRUM BRAKE FOR MOTOR VEHICLES

Info

Publication number
DE1480277B2
DE1480277B2 DE1964T0026062 DET0026062A DE1480277B2 DE 1480277 B2 DE1480277 B2 DE 1480277B2 DE 1964T0026062 DE1964T0026062 DE 1964T0026062 DE T0026062 A DET0026062 A DE T0026062A DE 1480277 B2 DE1480277 B2 DE 1480277B2
Authority
DE
Germany
Prior art keywords
brake
wheel
cylinder
wheel brake
drum
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
DE1964T0026062
Other languages
German (de)
Other versions
DE1480277A1 (en
Inventor
Ernst 6000 Frankfurt Meier
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Continental Teves AG and Co OHG
Original Assignee
Alfred Teves GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Alfred Teves GmbH filed Critical Alfred Teves GmbH
Priority to DE1964T0026062 priority Critical patent/DE1480277B2/en
Priority to US437434A priority patent/US3337009A/en
Priority to ES0311466A priority patent/ES311466A1/en
Priority to GB10580/65A priority patent/GB1111941A/en
Publication of DE1480277A1 publication Critical patent/DE1480277A1/en
Publication of DE1480277B2 publication Critical patent/DE1480277B2/en
Granted legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T11/00—Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant
    • B60T11/10—Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant transmitting by fluid means, e.g. hydraulic
    • B60T11/24—Single initiating means operating on more than one circuit, e.g. dual circuits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D51/00—Brakes with outwardly-movable braking members co-operating with the inner surface of a drum or the like
    • F16D51/16—Brakes with outwardly-movable braking members co-operating with the inner surface of a drum or the like shaped as brake-shoes pivoted on a fixed or nearly-fixed axis
    • F16D51/18—Brakes with outwardly-movable braking members co-operating with the inner surface of a drum or the like shaped as brake-shoes pivoted on a fixed or nearly-fixed axis with two brake-shoes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D51/00—Brakes with outwardly-movable braking members co-operating with the inner surface of a drum or the like
    • F16D51/16—Brakes with outwardly-movable braking members co-operating with the inner surface of a drum or the like shaped as brake-shoes pivoted on a fixed or nearly-fixed axis
    • F16D51/18—Brakes with outwardly-movable braking members co-operating with the inner surface of a drum or the like shaped as brake-shoes pivoted on a fixed or nearly-fixed axis with two brake-shoes
    • F16D51/26—Brakes with outwardly-movable braking members co-operating with the inner surface of a drum or the like shaped as brake-shoes pivoted on a fixed or nearly-fixed axis with two brake-shoes both extending in the same direction from their pivots
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D51/00—Brakes with outwardly-movable braking members co-operating with the inner surface of a drum or the like
    • F16D51/16—Brakes with outwardly-movable braking members co-operating with the inner surface of a drum or the like shaped as brake-shoes pivoted on a fixed or nearly-fixed axis
    • F16D51/18—Brakes with outwardly-movable braking members co-operating with the inner surface of a drum or the like shaped as brake-shoes pivoted on a fixed or nearly-fixed axis with two brake-shoes
    • F16D51/26—Brakes with outwardly-movable braking members co-operating with the inner surface of a drum or the like shaped as brake-shoes pivoted on a fixed or nearly-fixed axis with two brake-shoes both extending in the same direction from their pivots
    • F16D51/30—Brakes with outwardly-movable braking members co-operating with the inner surface of a drum or the like shaped as brake-shoes pivoted on a fixed or nearly-fixed axis with two brake-shoes both extending in the same direction from their pivots fluid actuated
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D51/00—Brakes with outwardly-movable braking members co-operating with the inner surface of a drum or the like
    • F16D51/46—Self-tightening brakes with pivoted brake shoes, i.e. the braked member increases the braking action
    • F16D51/48—Self-tightening brakes with pivoted brake shoes, i.e. the braked member increases the braking action with two linked or directly-interacting brake shoes
    • F16D51/52—Self-tightening brakes with pivoted brake shoes, i.e. the braked member increases the braking action with two linked or directly-interacting brake shoes fluid actuated
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D55/00—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes
    • F16D55/02—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D55/00—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes
    • F16D55/02—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members
    • F16D55/22—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads
    • F16D55/224—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads with a common actuating member for the braking members
    • F16D55/225—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads with a common actuating member for the braking members the braking members being brake pads
    • F16D55/2255—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads with a common actuating member for the braking members the braking members being brake pads in which the common actuating member is pivoted
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D55/00—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes
    • F16D55/02—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members
    • F16D55/22—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads
    • F16D55/228—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads with a separate actuating member for each side
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D65/00—Parts or details
    • F16D65/14—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position
    • F16D65/16—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position arranged in or on the brake
    • F16D65/18—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position arranged in or on the brake adapted for drawing members together, e.g. for disc brakes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2121/00—Type of actuator operation force
    • F16D2121/02—Fluid pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2123/00—Multiple operation forces

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Transportation (AREA)
  • Braking Arrangements (AREA)

Description

Die Erfindung bezieht sich auf eine Duplex-Trommelbremse der im Oberbegriff des Anspruches 1 angegebenen Art.The invention relates to a duplex drum brake as specified in the preamble of claim 1 Art.

Bei einer bekannten Duplex-Trommelbremse dieser Art (US-PS 30 67 842) ist jeweils einer Bremsbacke ein an einen unabhängigen Druckmittelkreis eines Zweikreisgebers angeschlossener Radbremszylinder zugeordnet, der fest mit dem Bremsschild verbunden ist. Eine Betätigung der beiden Bremsbacken einer Bremse setzt bei dieser Anordnung eine Betätigung beider Druckmittelkreise voraus, so daß bei Ausfall eines Druckmittelkreises nur noch eine Bremsbacke betätigbar ist, wodurch eine erhebliche Verminderung der Bremswirkung eintritt.In a known duplex drum brake of this type (US-PS 30 67 842) a brake shoe is in each case Assigned to an independent pressure medium circuit of a dual-circuit sensor connected wheel brake cylinder, which is firmly connected to the brake shield. An actuation of the two brake shoes of a brake assumes in this arrangement an actuation of both pressure medium circuits, so that in the event of failure of one Pressure medium circuit only one brake shoe can be actuated, whereby a considerable reduction in the Braking effect occurs.

Der Erfindung liegt die Aufgabe zugrunde, eine Duplex-Trommelbremse der eingangs genannten Art zu schaffen, deren beide Bremsbacken bei Ausfall eines Druckmittelkreises allein durch den anderen Druckmittelkreis betätigbar sind, so daß die volle Bremskraft erhalten bleibt.The invention is based on the object of providing a duplex drum brake of the type mentioned at the beginning create whose two brake shoes in the event of failure of one pressure medium circuit solely through the other pressure medium circuit can be actuated so that the full braking force is retained.

Es ist bereits eine Simplex-Trommelbremse für den Anschluß an die voneinander unabhängigen Druckmittelkreise einer Zweikreisbremslage bekannt (DT-PS 6 13 207). Der eine Radbremszylinder dieser Bremse weist zwei voneinander getrennte jeweils an einen Druckmittelkreis angeschlossene Arbeitskammern auf, ist verschiebbar am Bremsschild gelagert und seine Bremskolben sind mit festen Anschlägen versehen, mit denen sie sich in Bremslöserichtung am Gehäuse des Radbremszylinders abstützen. Bei Ausfall eines Druckmittelkreises wird nur ein Kolben betätigt und die am Gehäuse des Radbremszylinders angreifende Reaktionskraft über den festen Anschlag auf den anderen Bremskolben übertragen, so daß durch den einen Druckmittelkreis beide Bremsbacken an die Bremstrommel angelegt werden können. Eine derartige Anordnung ist auf Duplex-Trommelbremsen nicht übertragbar, da diese zwei diametral entgegengesetzt angeordnete Radbremszylinder mit jeweils nur einem Bremskolben aufweisen.It is already a simplex drum brake for connection to the pressure medium circuits that are independent of one another a dual-circuit braking position known (DT-PS 6 13 207). The one wheel brake cylinder of this brake has two separate working chambers each connected to a pressure medium circuit, is slidably mounted on the brake shield and its brake pistons are provided with fixed stops, with which they are supported in the brake release direction on the housing of the wheel brake cylinder. If a pressure medium circuit fails only one piston is actuated and the reaction force acting on the housing of the wheel brake cylinder transferred via the fixed stop to the other brake piston, so that by one Pressure medium circuit both brake shoes can be applied to the brake drum. Such a one Arrangement cannot be transferred to duplex drum brakes, as these two are diametrically opposed have arranged wheel brake cylinders each with only one brake piston.

Es ist auch eine Duplex-Trommelbremse mit einem einzigen Radbremszylinder bekannt (DT-PS 11 37 331). Der Radbremszylinder dieser Bremse weist aber nur einen Bremskolben auf, dessen Betätigungskraft über ein Hebelgestänge auf beide Bremsbacken übertragen wird. Diese Bremse eignet sich nicht für den Anschluß an zwei voneinander unabhängige Druckmittelkreise einer Zweikreis-Bremsanlage, weil der Radbremszylinder nur eine Arbeitskammer aufweist.A duplex drum brake with a single wheel brake cylinder is also known (DT-PS 11 37 331). The wheel brake cylinder of this brake has only one brake piston, the actuating force of which is above a lever linkage is transferred to both brake shoes. This brake is not suitable for connection to two independent pressure medium circuits of a dual-circuit brake system, because the wheel brake cylinder has only one working chamber.

Durch die im Patentanspruch 1 gekennzeichnete Erfindung wird die gestellte Aufgabe gelöst. Vorteilhafte Ausgestaltungen der Erfindung sind in den Ansprüchen 2 und 3 angegeben. Durch die im Anspruch 2 gekennzeichneten Mittel wird ein Hebelgestänge geschaffen, welches leicht herstellbar ist und welches sich den räumlichen Gegebenheiten einer von einer Radachse durchdrungenen Trommelbremse besonders gut anpaßt. Das Reibglied gemäß Anspruch 3 bewirkt, ' daß die beiden Radbremszylinder, solange beide Druckmittelkreise intakt sind, bezogen auf ihre Verschiebbarkeit in einer Mittelstellung verharren, auch wenn die Rückzugskräfte der beiden Rückzugsfedern der Bremse voneinander abweichen. Hierdurch wird die Einhaltung eines gleichmäßigen Bremslüftspiels an beiden Bremsbacken der Bremse gewährleistet.The object set is achieved by the invention characterized in claim 1. Beneficial Refinements of the invention are specified in claims 2 and 3. By in claim 2 marked means a lever linkage is created which is easy to manufacture and which especially the spatial conditions of a drum brake penetrated by a wheel axle adapts well. The friction member according to claim 3 causes' that the two wheel brake cylinders, as long as both Pressure medium circuits are intact, based on their displaceability, also remain in a central position if the retraction forces of the two retraction springs of the brake differ from each other. This will make the Compliance with an even brake clearance on both brake shoes of the brake is guaranteed.

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird im folgenden näher beschrieben.An embodiment of the invention is shown in the drawing and will be described in more detail below described.

In einer Bremstrommel 24 sind zwei Bremsbacken 26, 27 angeordnet, die mit einem Ende über Abstützbolzen 30 an einem Bremsschild 25 schwenkbar gelagert sind. An ihrem anderen Ende sind die Bremsbacken 26,27 mit den Bremskolben der Radbremszylinder 28, 29 verbunden. Beide Bremsbacken 26, 27 sind durch Rückstellfedern 31 miteinander verbunden, die die Bremsbacken in Bremslöserichtung gegen die Bremskolben drücken. Die Lösebewegung der Bremskolben ist gegenüber dem jeweiligen Radbremszylinder 28,29 durch ein selbsttäti- * ges, einseitig wirkendes Gesperre auf das erforderliche Λ Bremslüftspiel begrenzt.Two brake shoes 26, 27 are arranged in a brake drum 24, one end of which is pivotably mounted on a brake shield 25 via support bolts 30. At their other end, the brake shoes 26, 27 are connected to the brake pistons of the wheel brake cylinders 28, 29. Both brake shoes 26, 27 are connected to one another by return springs 31 which press the brake shoes against the brake piston in the brake release direction. The releasing movement of the brake pistons is limited to the required Λ brake clearance with respect to the respective wheel brake cylinder 28, 29 by an automatic, one-sided locking mechanism.

Die beiden Radbremszylinder 28,29 sind jeweils über einen Arm 37, 38 an am Bremsschild 25 befestigten Bolzen 33, 33' schwenkbar gelagert. In der Nähe der Radbremszylinder weisen die Arme 37, 38 je einen Bolzen 35, 35' auf, die jeweils in Rampen bildende Langlöcher 36 in beiderseits der Arme am Bremsschild 25 drehbar gelagerten Ringen 32, 32' eingreifen. Die Langlöcher 36 verlaufen zu dem sie schneidenden Bremstrommelradius derart geneigt, daß die beim Betätigen der Bremse an den Radbremszylindern 28,29 wirksamen Reaktionskräfte sich über die Ringe 32, 32' aufeinander abstützen und sich im Gleichgewicht halten. Die drehbare Lagerung der Ringe 32, 32' erfolgt am Bremsschild mittels einer Führung 34.The two wheel brake cylinders 28, 29 are each fastened to the brake shield 25 via an arm 37, 38 Bolts 33, 33 'are pivotably mounted. The arms 37, 38 each have one in the vicinity of the wheel brake cylinder Bolts 35, 35 ', the elongated holes 36, each forming ramps, in both sides of the arms on the brake shield 25 rotatably mounted rings 32, 32 'engage. The elongated holes 36 run to the intersecting one Brake drum radius inclined in such a way that when the brake is actuated on the wheel brake cylinders 28,29 effective reaction forces are supported on one another via the rings 32, 32 'and are kept in equilibrium. The rotatable mounting of the rings 32, 32 ′ takes place on the brake shield by means of a guide 34.

Die beiden Radbremszylinder 28, 29 sind jeweils an voneinander unabhängige Druckmittelkreise eines Zweikreisgebers, beispielsweise eines Tandemhauptbremszylinders, angeschlossen. Bei normaler Betätigung der Bremse wird in beiden Bremskreisen ein Druck erzeugt, so daß die Bremskolben beider Radbremszylinder 28, 29 betätigt werden und über Stößel die Bremsbacken 27, 26 entgegen der Kraft der Rückzugs-The two wheel brake cylinders 28, 29 are each connected to independent pressure medium circuits Two-circuit sensor, for example a tandem master brake cylinder, connected. With normal operation the brake, a pressure is generated in both brake circuits, so that the brake pistons of both wheel brake cylinders 28, 29 are actuated and the brake shoes 27, 26 against the force of the retraction

federn 3t in Anlage an die Bremsscheibe bringen. Beide Zylinder halten sich über die Hebel 37,38 und die Ringe 32,32' das Gleichgewicht.Bring the 3t springs into contact with the brake disc. Both cylinders are held by levers 37, 38 and the rings 32,32 'the balance.

Fällt einer der beiden Druckmittelkreise aus, beispielsweise der, an den der Radbremszylinder 29 angeschlossen ist, so wird der Radbremszylinder 28 allein betätigt. In diesem Fall bewegt der Bremskolben des Radbremszylinders 28 zunächst die Bremsbacke 27, bis diese an der Bremstrommel 24 anliegt. Die Reaktionskraft aus der Bremsanlegekraft wird von dem Radbremszylinder 28 über den Hebel 37, den Bolzen 35, die Ringe 32, 32' auf den Bolzen 35' des Hebels 38 übertragen und bewirkt eine Verschiebung des Radbremszylinders 29 in Bremsanlegerichtung. Da sich der Bremskolben des Radbremszylinders 29 über ein Gesperre am Radbremszylinder 29 abstützt, überträgt dieser die Bremsanlegebewegung des Radbremszylinders 29 auf die Bremsbacke 26, so daß diese nach Überwindung des vorhandenen Bremslüftspiels ebenfalls in Reibschluß mit der Bremstrommel 24 gelangt.If one of the two pressure medium circuits fails, for example the one to which the wheel brake cylinder 29 is connected, the wheel brake cylinder 28 is actuated alone. In this case the brake piston moves of the wheel brake cylinder 28 first the brake shoe 27 until it rests against the brake drum 24. the Reaction force from the brake application force is generated by the wheel brake cylinder 28 via the lever 37, the bolt 35, the rings 32, 32 'transferred to the bolt 35' of the lever 38 and causes a displacement of the wheel brake cylinder 29 in brake application direction. Since the brake piston of the wheel brake cylinder 29 has a The lock is supported on the wheel brake cylinder 29, this transmits the brake application movement of the wheel brake cylinder 29 on the brake shoe 26, so that this also after overcoming the existing brake clearance comes into frictional engagement with the brake drum 24.

Bei Ausfall des an den Radbremszylinder 28 angeschlossenen Bremskreises erfolgt die Kraftübertragung über das Hebelgestänge in umgekehrter Richtung. Die am Radbremszylinder 29 auftretende Reaktionskraft bewirkt eine mechanische Betätigung des Radbremszylinders 28 und der Bremsbacke 27.If the brake circuit connected to the wheel brake cylinder 28 fails, the force is transmitted via the lever linkage in the opposite direction. The reaction force occurring at the wheel brake cylinder 29 causes a mechanical actuation of the wheel brake cylinder 28 and the brake shoe 27.

Das beschriebene Ausführungsbeispiel zeigt, daß mit den erfindungsgemäßen Maßnahmen beide Bremsbakken einer Duplex-Trommelbremse auch bei Druckbeaufschlagung nur eines Radbremszylinders betätigt werden können, so daß die volle Bremswirkung erhalten bleibt. Anstelle der Ringe zur mechanischen Übertragung der Reaktionskräfte können auch Kuppelstangen oder andere mechanische Glieder verwendet werden.The embodiment described shows that, with the measures according to the invention, both brake pads a duplex drum brake operated even when only one wheel brake cylinder is pressurized can be so that the full braking effect is retained. Instead of the rings for mechanical transmission For the reaction forces, coupling rods or other mechanical links can also be used.

Hierzu 1 Blatt Zeichnungen1 sheet of drawings

Claims (3)

Patentansprüche:Patent claims: 1. Duplex-Trommelbremse für Kraftfahrzeuge, mit zwei am Bremsschild fest abgestützten Bremsbacken, die von zwei jeweils an voneinander unabhängige Druckmittelkreise eines Zweikreisgebers angeschlossenen Radbremszylindern an die Bremstrommel anlegbar sind, dadurch gekennzeichnet, daß beide Radbremszylinder (28, 29) am Bremsschild (25) beweglich gelagert und über ein Hebelgestänge (32,32', 35,35', 36,37,38) in Bremslöserichtung gegeneinander abgestützt sind und daß die Lösebewegung der Bremskolben gegenüber dem jeweiligen Radbremszylinder (28, 29) durch ein einseitig wirkendes, selbsttätiges Gesperre auf den Betrag des Bremslüftspiels begrenzt ist.1. Duplex drum brake for motor vehicles, with two brake shoes firmly supported on the brake plate, that of two independent pressure medium circuits of a two-circuit sensor connected wheel brake cylinders can be applied to the brake drum, characterized in that that both wheel brake cylinders (28, 29) are movably mounted on the brake plate (25) and via a lever linkage (32,32 ', 35,35', 36,37,38) in Brake release direction are supported against each other and that the release movement of the brake piston with respect to the respective wheel brake cylinder (28, 29) by a one-sided, automatic Lock is limited to the amount of brake clearance. 2. Duplex-Trommelbremse nach Anspruch 1, dadurch gekennzeichnet, daß jeder Radbremszylinder (28, 29) mit einem Arm (37, 38) am Bremsschild (25) angelenkt und über einen oder mehrere am Bremsschild (25) drehbar gelagerte Ringe (32, 32') mit dem jeweils anderen Radbremszylinder (29, 28) gekuppelt ist, wobei die Arme (37, 38) jeweils mit einem Bolzen (35, 35') in Rampen bildende Ausnehmungen (36) der Ringe (32,32') eingreifen.2. Duplex drum brake according to claim 1, characterized in that each wheel brake cylinder (28, 29) hinged with an arm (37, 38) on the brake shield (25) and one or more on the Brake shield (25) rotatably mounted rings (32, 32 ') with the respective other wheel brake cylinder (29, 28) is coupled, the arms (37, 38) each having a bolt (35, 35 ') forming ramps Recesses (36) of the rings (32,32 ') engage. 3. Duplex-Trommelbremse nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Beweglichkeit der Radbremszylinder (28, 29) gegenüber dem Bremsschild (25) durch ein Reibglied gehemmt ist.3. Duplex drum brake according to claim 1 or 2, characterized in that the mobility the wheel brake cylinder (28, 29) is inhibited with respect to the brake shield (25) by a friction member.
DE1964T0026062 1964-04-23 1964-04-23 DUPLEX DRUM BRAKE FOR MOTOR VEHICLES Granted DE1480277B2 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
DE1964T0026062 DE1480277B2 (en) 1964-04-23 1964-04-23 DUPLEX DRUM BRAKE FOR MOTOR VEHICLES
US437434A US3337009A (en) 1964-04-23 1965-03-05 Brake system with twin fluid-supply networks
ES0311466A ES311466A1 (en) 1964-04-23 1965-04-06 A drum brake device or partial floating disc. (Machine-translation by Google Translate, not legally binding)
GB10580/65A GB1111941A (en) 1964-04-23 1965-04-23 Improvements in friction brakes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1964T0026062 DE1480277B2 (en) 1964-04-23 1964-04-23 DUPLEX DRUM BRAKE FOR MOTOR VEHICLES

Publications (2)

Publication Number Publication Date
DE1480277A1 DE1480277A1 (en) 1969-10-09
DE1480277B2 true DE1480277B2 (en) 1976-11-04

Family

ID=7552513

Family Applications (1)

Application Number Title Priority Date Filing Date
DE1964T0026062 Granted DE1480277B2 (en) 1964-04-23 1964-04-23 DUPLEX DRUM BRAKE FOR MOTOR VEHICLES

Country Status (4)

Country Link
US (1) US3337009A (en)
DE (1) DE1480277B2 (en)
ES (1) ES311466A1 (en)
GB (1) GB1111941A (en)

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DE3300375A1 (en) * 1982-07-21 1984-02-09 Hanke, Heinrich, 4970 Bad Oeynhausen Device for elastically supporting the load on vehicles and the like

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US3448835A (en) * 1966-04-23 1969-06-10 Aisin Seiki Disc brake apparatus for vehicles
DE1680828C3 (en) * 1966-05-07 1973-10-04 Alfred Teves Gmbh, 6000 Frankfurt Hydraulic actuation device of a friction brake, in particular a partially lined disc brake, for motor vehicles
DE1655310B1 (en) * 1966-11-12 1970-09-03 Teves Gmbh Alfred Pressure medium-operated partial-lined disc brake, especially for motor vehicles
US3490565A (en) * 1966-11-16 1970-01-20 Teves Gmbh Alfred Piston assembly for dual-network disk-brake system
US3750857A (en) * 1966-11-16 1973-08-07 Teves Gmbh Alfred Piston assembly for dual-network disk-brake system
DE1655313C3 (en) * 1966-11-16 1974-01-24 Alfred Teves Gmbh, 6000 Fankfurt Dual-circuit brake cylinders, in particular for disc brakes
JPS4818983B1 (en) * 1969-11-20 1973-06-09
FR2314399A1 (en) * 1975-06-13 1977-01-07 Ferodo Sa DISC BRAKE
US4134478A (en) * 1977-07-18 1979-01-16 Caterpillar Tractor Co. Brake apparatus including plural actuating assemblies
DE3135864C2 (en) * 1981-09-10 1983-09-22 Riza Akhisar Hovardaoglu Hydraulic dual circuit simplex drum brake
FR2533989B1 (en) * 1982-09-30 1987-04-17 Dba SLIDING CALIPER DISC BRAKE SPRING, AND DISC BRAKE PROVIDED WITH SUCH A SPRING
DE3627123C2 (en) * 1986-08-06 1997-10-09 Vdo Schindling Liquid level sensor

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Publication number Priority date Publication date Assignee Title
DE3300375A1 (en) * 1982-07-21 1984-02-09 Hanke, Heinrich, 4970 Bad Oeynhausen Device for elastically supporting the load on vehicles and the like

Also Published As

Publication number Publication date
GB1111941A (en) 1968-05-01
ES311466A1 (en) 1965-12-16
US3337009A (en) 1967-08-22
DE1480277A1 (en) 1969-10-09

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Legal Events

Date Code Title Description
C3 Grant after two publication steps (3rd publication)
E77 Valid patent as to the heymanns-index 1977
EHJ Ceased/non-payment of the annual fee